DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 259: Effect of aspect ratio on momentum confinement | ||
| Name: | Wayne M. Solomon ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Rotation Physics | Presentation time: | Not requested | Co-Author(s): | S.M. Kaye, C.C. Petty |
| Description: | The goal of the experiment is to obtain the first comparison of momentum confinement between NSTX and DIII-D, using perturbative techniques in order to separate out the roles of diffusion versus convection of momentum transport. | ||
| Experimental Approach/Plan: | A short perturbation to the rotation can be applied using n=3 non-resonant braking on both DIII-D and NSTX. DIII-D also has the option of using co/counter NBI blips for comparison. By performing the experiments on the two machines at fixed dimensionless parameters, the dependence of momentum confinement on aspect ratio can also be determined. Note that because beta between the machines is so inherently different, it cannot be held constant. Similar to the energy confinement similarity experiments in 2005 between NSTX and DIII-D, a more accessible dimensionless quantity is beta_p. Therefore, the dimensionless parameters to hold fixed would be the poloidal gyroradius, poloidal beta, nu* and the safety factor. | ||
| Background: | Similarity experiments on energy confinement were run between DIII-D and NSTX in 05. These shots should be investigated to see what refinements are necessary to make suitable candidates for these experiments (eg low n=1 MHD etc). | ||
| Resource Requirements: | Machine Time: 1 day Experiment
Number of neutral beam sources: 7 | ||
| Diagnostic Requirements: | CER and all profile diagnostics | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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